Low Temperature Physics: 34, 385 (2008); https://doi.org/10.1063/1.2913001 (3 pages)
Физика Низких Температур: Том 34, Выпуск 4-5 (Апрель 2008), c. 480-483 ( к оглавлению , назад )
Confinement effects on decay rate of surface electron states over liquid helium
S.S. Sokolov1, J.M. Villas-Bôoas2, Yu.P. Monarkha1, and Nelson Studart3
1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
2Walter Schottky Institut, Technische Universität München, Am Coulombwall, D-85748 Garching, Germany
3Departamento de Física, Universidade Federal de São Carlos, 13565-905, São Carlos, São Paulo, Brazil
Received November 23, 2007
The decay rate of excited states of surface electrons in liquid helium, trapped in a quantum dot system, is evaluated, taking into account the process of spontaneous radiation of two-ripplons with short wavelength. We find that the values of the decay rate in later process are rather higher than those for the one-ripplon process previously calculated. The upper-bound limit lifetime of excited states of surface electrons in a quantum dot is found to be t < 10-6–10-7 s.
PACS: 73.20.–r Electron states at surfaces and interfaces;
Key words: quantum dot, two-ripplon process, lifetime of excited states.